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Larval feeding by Hypera postica (Gyllenhal) on first cutting alfalfa reduced both the yield and quality of the crop. A linear reduction in yield was observed over most of the population range. The amount of loss attributable to a single larva and the smallest larval density (SLD) that produced the maximum yield reduction was dependent upon the size of alfalfa plant during the time of attack. Larger plants were able to withstand larger larval densities. Associated with this yield change was a significant increase in yield at larval densities equivalent to 15–22% of the SLD value. A reduction in stem elongation occurred at a density of 30–100% of the SLD value. Quality (crude protein and in-vitro dry matter digestibility) losses were observed over most of the range with a significant increase occurring at a larval density equivalent to 25–35% of the SLD value.
Document Type: Research Article
Publication date: December 1, 1976
More about this publication?
Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.